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27-
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Detailed Description
Seam pipe bolt
Seam pipe bolt is specificity strong supporting supplies, is the underground culvert roof and other projects supporting the use of advanced materials, has simple manufacturing process, easy to use, has strong anchoring force in underground of support by rockbolt and shotcrete, applied for big, strong expansion force, make the whole roof.
一, working principle and characteristics
Seam pipe bolt is a kind of full length anchoring, actively reinforce the surrounding rock of the new bolt, seam pipe bolt solid part is a vertical slit of high strength steel tube, when installed on pipe diameter smaller than the hole, can immediately within the scope of the length of the radial pressure and prevent the surrounding rock of hole wall in friction, plus plate bolt tray retainer force, so that to stress state of surrounding rock in the three and achieve the great rock. Seam pipe bolt under blasting vibration of rock anchor to move, and so on and so forth, later the anchoring force are increased obviously, when the displacement of surrounding rock of significant, does not lose its anchor supporting force, it than shell bolt has better properties.
二、Seam pipe bolt main performance and specifications
1、Main technical performance
(1) the initial anchorage force: 3 ~ 7 tons;
(2) pipe ring pulled off load: 8 ~ 10 tons;
(3) pipe bolt tensile resistance: 12 ~ 13 tons;
(4) corrosion resistance than A3 steel, 20 to 30% more for use for a long time
2、technical requirements
1）Seam pipe bolt surface should be smooth, no serious injury, rust. Weld shall be no crack, no porosity, slag inclusion, are not allowed to burn through the wall. The tray on the rod body should be able to move freely. With the seam opening displacement between baffle ring 170 o - 190 o is advisable.
2) baffle ring weld pulled off force p 80 kn, pushing rod body limit 110 kn, or at the beginning of the anchor force p 25 kn/m, tray or greater bearing capacity of 65 kn.
3、Products use
First with a pneumatic drill bolt holes in the roof, the tray set into the anchor rod body, reoccupy FengChui will bar into the bolt hole in the body, make the tray and roof help and paste. Users in the use of bolt, the choice of the hole diameter in addition to refer to the table, should according to the specific conditions of rock, as stipulated in the GBJ86 standard selection.
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